What is defined contribution plan?

Types of Defined Contribution Plans

The 'defined contribution' category includes several plan types, each designed for different employment contexts:

• 401(k): For-profit employers. The most common DC plan, with pre-tax and Roth contribution options. Limit: $24,500 employee + employer contributions.
• 403(b): Tax-exempt organizations (schools, hospitals, nonprofits). Similar rules to 401(k) with some additional catch-up provisions for long-tenured employees.
• 457(b): State and local government employees. Key advantage: no 10% early withdrawal penalty for distributions at any age after separation from service.
• SIMPLE IRA: Small employers (under 100 employees). Lower contribution limits ($17,000) with required employer contributions, either matching employee contributions or paid even when employees don't contribute.
• Thrift Savings Plan (TSP): Federal employees and military. Five low-cost index fund options. Same contribution limits as 401(k).

The Risk Transfer Problem

The shift from defined benefit to defined contribution plans is often framed as giving workers 'choice' and 'portability.' The less-discussed consequence is a massive transfer of financial risk:

• Investment risk: Workers must choose investments and bear market losses. During 2008, the average 401(k) balance dropped 31%. Defined benefit pensioners were unaffected.
• Longevity risk: Workers must estimate how long they'll live and manage withdrawals accordingly. Outliving your savings is possible with DC plans or a DB lump sum, while a DB lifetime annuity protects against outliving its payments.
• Inflation risk: DC plan balances are fixed-dollar amounts that lose purchasing power over time. Many DB plans include COLA adjustments.
• Behavioral risk: Workers must make complex decisions about contribution rates, asset allocation, and withdrawal timing. Optimal decisions require financial expertise most workers lack.

The result: retirement outcomes under DC plans are dramatically more unequal than under DB plans. High-income workers with financial literacy accumulate substantial balances, while lower-income workers often have negligible savings.

Why Outcomes Are Often Inadequate

The median 401(k) balance of $44,115 tells the story. Under the 4% withdrawal rule (a common retirement planning guideline), $44,115 generates about $1,765/year — $147/month. Next to the average Social Security benefit ($2,071/month), that's a small addition to retirement income.

Contributing factors:

• Low contribution rates: Average deferral rate is approximately 7.4% of salary — well below the 15-20% most advisors recommend.
• Leakage: 6% of Vanguard participants in plans offering the option took a hardship withdrawal in 2025 and 13% have outstanding loans, permanently reducing retirement savings.
• Cash-out at job change: Approximately 40% of workers cash out their 401(k) when changing jobs rather than rolling over, destroying accumulated savings.

Defined Contribution Plans and the ADI

The American Distress Index captures buffer depletion through its Safety Net & Buffer domain, one of five equal-weighted domains, which the composite scores from the personal saving rate (inverted). Defined contribution plan strain is contextual evidence of the same buffer depletion: Vanguard reports hardship withdrawals by 6% of its participants and outstanding plan loans for 13% in 2025, and the personal savings rate was 3.8% in September 2026. Withdrawals and loans draw retirement money into current spending.